Original Japanese Military magnetic compass, made by Tokyo Aero Indicator Co. Very rare, used in early aircraft of the Japanese Army (Type 91 Fighter, Type 95 Model 3 Trainer, Type 97 Heavy Bomber, Type 98 Direct Co-operation aircraft, Type 99 Trainer, and Type 100 Transport) but also used in the Type 97 Mitsubishi Ki-21 Sally Bomber. Need restoration, the Compass inside works very well. Measures 6" Height, approximately 4 1/2" Length & 4 5/8 Width.